Grinding-machine.



H. T. SHEARER.

GRINDING MACHINE.

APPLICATION FILED APR.19, 191s.

1, 1 1 3,914, f .Patented 001.1311914.

2 SHEETS-SHEET l.

H. T. SHEARER.

' GRINDING MACHINE.

APPLICATION FILED APR. 19, 1913.

11,113,914. l Patented Oct. 13,1914.

2 SHEETS-SHEET 2.

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HARRY T. SHEAEEE, or wAYNEsBoRo, PENNSYLVANIA.

. @BINDING-MACHINE.

To all 'whom it may concern: y Be it known that I, HARRY T. SHEARER, a

'citizen of the United States, residing at Waynesboro, Franklin county,and State of Pennsylvania, have invented and discovered certain new anduseful Improvements in Grinding-Machines, of which the followlng.

is a specification. A

My said invention consists in an improved construction and arrangementof parts of automatic cross feed mechanism for the grinding wheels ofgrinding` machines,

whereby such a mechanism is provided which is positive in its action andwhich operates during the period of the tarry of the .grinding wheelcarriage at each reversing point, all as will be hereinafter more fullydescribed'and claimed.

Referring to the accompanying drawings, which are made a part hereof andon which similar reference characters indicate .simiv lar parts, Figure1 is a rear view of a portion of a grinding machine yof the Landis typeillustrating the portions of the mechanism to which my said inventionrelates;

Fig. 2 a detail elevation of the parts as seen when looking in thedirection indicated by the arrows from the dotted line 2-2 in Fig. 1;Fig. 3 a detail plan view of the gearing separate fromthe framework,show' g its relative arrangement, one part to another; and, Fig. 4 adetail view on the dotted line 4-4 in Fig. 3. 1

In said drawings the portions marked A represent the grinding wheelcarriage; B the grinding wheel base; and C the transverse slide on topof the carriage on which said base is adapted to move to feed thegrind`l ing wheel to and from the work. All of" these parts aresubstantially of the wellknown Landis type and their construction andarrangement being well understood need not be further explained exceptincidentally in describing the invention. l

rlhe mechanism for feeding the rinding wheel to the work comprises a rac10, secured to the slide C with which a pinion `11 on the lower'end of avertical shaft 12 is adapted to engage. Said shaft 12 is-journaled ingrinding wheel base B and has a worm gear 13 on its upper end with whicha worin 14 on the end oa horizontal shaft 15 engages. Said shaft 15 issupported in appropriate bearings on the carriage and carries a ratchetfeed wheel 16 on its outer end adapted to be operated by apawl 17ISpecication of Letters Patent. y

Application med April 19, i913. serialNo..7z3eo;-. r

connected vwith `a reciprocating member 18 throughthe medium of anglelever 19 pivyoted. at 20 andconnected withfsaid reciproeating member bypivot 21. Said angle 1ever 19 has a segment gear 22 on its upper endadapted to engage with a similar gear 23` on the lower end of an anglearm 24 pivoted at 25 and carrying said pawl 17 on its outer end. Saidvreciprocating member 18 is in the form of a weight and at its lower endrests on arm 70 on one side of 'a housing 26 carried on the upper end ofthe plunatentd 0615.13, 1914.

ger 27.` Said plunger is mounted in a suitable hollow standard 28carried by the grinding wheel carriage. l

A 'rack bar 29 is mounted to have a limited sliding movement on theunder side of the grinding wheel carriage and a rod 30 is connectedtherewith by a slot 34 and pin 35. Said bar extends between a fixedroller 31 mounted in the lower end of standard 28 and another roller 32Imounted on a horiplunger 27; A diamond-shaped cam 33 is formedormounted on said rod 30 adjacent to said rollers 31 and 32. The slot andpin connection with said slidingrack 29 permits l a limited independentmovement. of said rod for a purpose to be presently described. Anotherrack bar 36 is fixed on the grinding wheel carriage A with which apinion 37 on lahorizontal transverse shaft 38 is adapted end whichmeshes with theteeth of rack 29.

A drivingshaft'45 geared to the main drivj ing mechanism (not shown) has-a bevel gear wheel 46 meshin o n .shaft 38 an, is provided with adriving'clutch part 47'adapted to beshifted by with bevel gear wheel 40Azontal pivot carried by the lower end of g mechanism, comprising awheel 50 carrying injthis type of machine.

l .ent invention is as follows: The machine being in operation and theparts being in the position illustrated in Fig. l, the carriage is aboutto reverse and start to travel in the direction indicated by the largearrow at `the top in said figure. The power is transmitted, as abovedescribed, from the driving shaft 45 through the gears 46 and 40 to the'shaft 43 which, through the rack 29, operates the carriage back andforth. As the carriage reaches the limit of its movement in onedirection and the clutch part 47 is thrown, through the mechanism beforedescribed, from one driving gear to the other. The first movement of thegear will operate through the connections above mentioned to slide rack29 in the direction indicated by the small arrow on the underfside inFig. 1, and to draw cam 33 from the outside contact with rollers 31 and32 between said rollers. As said cam rides up over the lower roller 3l,it elevates plunger 27, reciprocating member 18 and the connected parts,and operates shaft 12 and, through its connection with the rack 10,feeds carriage, B forward, carrying the grinding wheel one step -intothe Work. i The movement of said rack before its contact with shoulder56 is just suiiicient to bring the-apex of the diamondshaped cam overthe center line of rollers 31 and 32, whereupon the weight iofreciprocating part 18, and other parts carried by the plunger 27, servesto slide said rod independently and carry the other end of its slot 34against pin 35. The end of rack-bar 29 being then against shoulder 56,`the carriageA will start to move. This'operation insures the positivevand accurate feed of the grinding wheel to the work` and While thecarriage is standing at a tarry so that the extreme ends of the Workreceive the same amount of grinding and are reduced to the same degreeas thevother partsl of the work being operated upon. The operation isthe same at the opposite end of the work, the parts being fset for-thefeeding operation bythe appropriate end of slot 34 being ,in contactwith pin 35, and continues in this manner until the work is reduced toav predetermined size,f-faut omatically regulated by mechanism common tothis type of machine and not shown or described herein.

Rack 36 operates through shaft 38 to turn wheel 50 carrying dogs 51 and52 set to operate the reversing mechanism at the desired points. Handwheel 39 may be used to traverse the carriage A by hand, as for setting,adjustment, etc.

Having thus fully described my said invention, what I claim as new, anddesire to secure by Letters Patent is:

1. An automatic cross feed for the grinding wheel of grinding machinescomprising a reciprocating rack-bar mounted on the grinding wheelcarriage and adapted to move independently thereof for a limiteddistance, feed mechanism connected with the grinding wheel base, areciprocating plunger for operating said mechanism, and a, cam connectedwith said rack-bar to have aV limited independent movement and mountedto operate said plunger, substantially as set forth.

2. An automatic feed mechanism for the grinding wheel of grindingmachines comprising a wheel base, the grinding wheel carriage on whichthe wheel base is mounted, a rack-bar carried on said grinding wheelcarriage and mounted to have a limited independent movement, gearingconnected with said rack-bar for operating the carriage, reversingmechanism, gearing for feeding said wheel base forward step by step, avertically reciprocating plunger connected to operate said feedingmechanism, and a cam mounted to operate said reciprocating plunger andconnected with said rack-bar to have a limited independent movement,substantially as set forth.

3. In a grinding machine the combination of a grinding vwheel carriage,a grinding wheel base mounted to slide transversely on Said carriage,mechanism for feeding said grinding wheel base toward and from the Workstep by step, a reciprocating plunger mounted on said grinding wheelcarriage for operating said mechanism, a cam for operating said plunger,a rack-bar mounted :on said grinding wheel carriage to have a limitedindependent movement, a connection between said rack-bar and said camadapted to permit a limited independent movement between said parts, andgearing connecting said rack-bar with the driving mechanism,substantially as set forth.

4. In a grinding machine the combination of a grinding wheel carriage,mechanism for traversing said carriage, a grinding wheel base mounted toslide transversely on said carriage, mechanism for sliding said wheelbase step by step, a reciprocating 'plunger for operating saidmechanism, and a .cam for operating said plunger connected to saidgrinding wheel carriage, substantially as set forth.

5. In a grindin machine the combination of a grinding w eel carriage, agrinding fao wheel base mountedto slide transversely thereon, mechanismfor sliding said grind-- ing wheel base step by step, a reciprocatingplunger for operating said mechanism, a cam for reciprocating saidplunger, a rackbar on said carriage connected with said cam, andtraversing and reversing mechanism geared to said rack-bar,substantially as set forth.

6. In a grinding machine the combination of a grinding Wheel carriage, agrinding wheel base mounted to slide transversely on said carriage,means for traversing said carriage back and forth, comprising a rackmechanism for sliding said grinding Wheel base across said carriage, anda cam connected to said rack and arranged to be operated by the traverseof the carriage for oper ating the mechanism for sliding said Wheelbase, substantially as set forth.

7. A grinding machine comprising a grinding Wheel carriage, means fortraversing said carriage, a grinding Wheel base mounted to slide acrosssaid carriage, mechanism for feeding said grinding Wheel base step bystep, and a cam for operating said mechanism connected to said grindingwheel carriage to have a limited independent movement whereby the feedof the grinding Wheel to the work is accomplished during the tarry ,ofthe carriage at each reverse thereof, substantially as set forth.

8. A grinding machine comprising a grinding wheel carriage, a grindingWheel base .mounted to slide across said carriage, means for operatingsaid base to feed the grinding wheel step by step to the Work, areciprocating part for operating said mechanism, a cam for operatingsaid reciprocating part, a rack-bar mounted on the grinding Wheelcarriage to slide independently thereof for a limited distance, aconnection between said rack-bar and said cam to permit a limitedindependent movement, driving mechanism, and gearing connecting saiddriving mechanism With'said rack-bar, substantially as set forth.

9. A grinding' machine comprising a grinding Wheel carriage, a grindingWheel base mounted to slide across said carriage, mechanism for feedingsaid grinding vvheel` base step by step to the Work, an operativeconnection between said mechanism and the grinding Wheel carriageembodying a rackbar having a limited independent movement, gearingconnecting said rack-bar With-the driving mechanism, said drivingmechanism embodying a reversing gear, means for operating said reversinggear, a second rackbar fixed upon said grinding wheel carriage, and aconnection between said rack-bar and the means for operating saidreversing gear, substantially as set forth.

In Witness whereof, I have hereunto set my hand and seal at Waynesboro,Pennsylvania, this'Qlst day of March, A. D. nineteen hundred andthirteen.

HARRY T. SHEARER.

lVit-nesses:

K. H. WASHABAUGH, C. F. KooNs.

